Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328l..59t&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 328, May 15, 1988, p. L59-L63.
Astronomy and Astrophysics
Astrophysics
14
Binary Stars, Cataclysmic Variables, Stellar Radiation, Stellar Spectrophotometry, Astronomical Photometry, Magnetic Stars, White Dwarf Stars
Scientific paper
UBVRI and long-term plate photometry is presented of the faint and highly erratic cataclysmic variable discovered by Hawkins (1981, 1983) from a sequence of UK Schmidt measurements. Observations of the V roughly 18 star over two consecutive nights show pronounced and repeatable modulation at a binary period of 108.6 minutes. Dramatic color differences are evident in the folded UBVRI light curves which are strongly suggestive of cyclotron emission from two magnetic accretion funnels in an AM Herculis binary system. The binary period and the long time scale two-state activity of the source also support this classification. It is concluded that the object is almost certainly a new AM Herculis variable, and a model is developed in which the blue and red components originate from two nondiametric (and probably nonpolar) cyclotron regions that are characterized by differing electron temperatures and opacities.
Ferrario Lilia
Hawkins R. S. M.
Tuohy Ian R.
Wickramasinghe Dayal T.
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